Beaming from ear to ear, Carole Middleton looked very much at home with the royal set as she attended the Order of the Garter service.
And it looks like the Duchess of Cambridge’s mother had been consulted over the coordination of their outfits as she stepped out in pastels and nude heels, just like members of the Windsor clan.
She was lending her support to her son-in-law Prince William, who was took part in the traditional procession to St George's Chapel in Windsor Castle.
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William joined other Knights of the Garter, wearing the traditional blue velvet cape and a black ostrich plume-adorned hat.
Kate, beautiful in the same white Alexander McQueen coat she wore for last year’s Trooping the Colour service, looked delighted to see her husband take part in the ceremony.
Fellow knights include the Duke of Edinburgh and the Earl of Wessex, Princess Anne and Prince Andrew.
The Queen – who is the only person authorised to grant membership – is known as the Sovereign of the Garter.
It's a little princess!